The Human Brain During the Third Trimester

GW26 Horizontal, CR 235 mm, Y16-59

TTeemmppoorraal lol lobbee

Cerebellum

(hemisphere)

Cere bellum

(hemisphere )

Inferior temporal gyrus

Inferior olive complex

Layer I

Cortical plate (Layers II-III)

2

2

4

5

11

3

2

Cochlear nuclei

Nerve V

Lateral reticular nucleus

Middle cerebellar peduncle

Middle cerebellar peduncle

Inferior olive complex

Middle cerebellar peduncle

Pyramidal decussation

Inferior cerebellar peduncle

Raphe nuclear complex

Pyramidal decussation

Raphe nuclear complex

Gracile fasciculus

Spinal tract (V)

Spinocerebellar tracts

Spinocerebellar tracts

Central canal (medulla)

Central canal (spinal cord)

Cuneate fasciculus

Lateral corticospinal tract

Choroid plexus

Ve ntral corticospinal tract

Ve ntral corticospinal tract

Spinal cord

Spinal cord

Spinal cord

MedullaMedulla

MedullaMedulla

Medulla

Transpontine corticofugal tract

Transpontine corticofugal tract

Corticospinal tract

Pontine gray

Pontine gray

Pontine gray

Superior olive complex

Motor nucleus (VII)

PPonsons

PPonsons

Cere bellum

(hemisphere )

PPonsons

Level 16: Section 940

Level 17: Section 960

Level 15: Section 900

Remnants of the germinal matrix, migratory streams, and transitional fields

2 External germinal layer (cerebellar)

3 Subpial granular layer (cortical)

4 Dorsal funicular myelination gliosis

5 Ve ntral funicular myelination gliosis

1 Medullary glioepithelium/ependyma

See higher magnification view

in Plates 242A and B.

See higher magnification view

in Plates 243A and B.

See higher magnification view

in Plates 244A and B.

5

5

PLATE 229